#include <stdio.h>
int main()
{
    void actionl(int, int),action2(int, int);
    char ch;
    int a=15,b=23;
    ch=getchar();
    switch(ch)
    {
        case 'a':
        case 'A': actionl(a,b);break;
        case 'b':
        case 'B': action2(a,b);break;
        default: putchar('\a');
    }
    return 0;
}

void action1(int x, int y)
{
    printf("x+y=%d\n",x+y);
}
void action2(int x, int y)
{
    printf("x*y=%d\n",x*y);
}